I was in charge of recording a task fMRI dataset with a fast TR of 600ms. We’ve recorded 17 subjects, 6 runs of 600 volumes each (vox.res.=3x3x3; slab through V1 and A1), with 28 events per run (ISI=12s). Tonotopy and Retinotopy were also recorded, with a TR of 600ms as well.
Participant’s consent for publicly sharing the data was acquired and the ethics specified that the data will be shared via openneuro. Unfortunately, I’m not the decider of the time-line and cannot predict when this dataset will be available. But if the interest is there, I’m happy to inquire if a collaboration can be established to facilitate and accelerate access to the data.
On a side note: I personally was also looking for a fast TR dataset last year and went through many public sources. The NARPS dataset was by far the best with a fast TR, a lot of subjects, and a very high quality of data.